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INCOME TAXES INCOME TAXES (Income tax examination) (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Oct. 31, 2017
Internal Revenue Service (IRS)    
Income Tax Examination [Line Items]    
Open tax year, from date Nov. 01, 2015  
Malaysia Tax Authority [Member]    
Income Tax Examination [Line Items]    
Income Tax Examination, Description The company was audited in Malaysia for the 2008 tax year. Although this tax year pre-dates our separation from Agilent, pursuant to the agreement between Agilent and Keysight pertaining to tax matters, as finalized at the time of separation, for certain entities, including Malaysia, any historical tax liability is the responsibility of Keysight.  
Income Tax Examination, Penalties and Interest Expense   $ 68
Majority of company's entities [Member] | Foreign Tax Authority    
Income Tax Examination [Line Items]    
Open tax year, from date Nov. 01, 2014  
Certain foreign entities [Member]    
Income Tax Examination [Line Items]    
Open Tax Year 2008